From mboxrd@z Thu Jan  1 00:00:00 1970
From: peterz@infradead.org
Date: Thu, 23 Jul 2020 18:47:59 +0000
Subject: Re: [PATCH v3 5/6] powerpc/pseries: implement paravirt qspinlocks for SPLPAR
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To: Waiman Long <longman@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>, Nicholas Piggin <npiggin@gmail.com>, linuxppc-dev@lists.ozlabs.org, Will Deacon <will@kernel.org>, Boqun Feng <boqun.feng@gmail.com>, Ingo Molnar <mingo@redhat.com>, Anton Blanchard <anton@ozlabs.org>, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org

On Thu, Jul 23, 2020 at 02:32:36PM -0400, Waiman Long wrote:
> BTW, do you have any comment on my v2 lock holder cpu info qspinlock patch?
> I will have to update the patch to fix the reported 0-day test problem, but
> I want to collect other feedback before sending out v3.

I want to say I hate it all, it adds instructions to a path we spend an
aweful lot of time optimizing without really getting anything back for
it.

Will, how do you feel about it?